Microbial cell-free protein synthesis and its progression toward industrial use

Industrial adoption of microbial cell-free protein synthesis (CFPS), an in vitro protein production platform that uses transcription and translation machinery from lysed cells, remains limited despite sustained technical progress across the field. This perspective positions microbial CFPS within a manufacturing context, focusing on its current capabilities, the limits of those capabilities and the concrete steps required for industrial adoption. In CFPS, the absence of cell growth constraints supports rapid protein production, simplified upstream workflows and direct control over reaction conditions, while also lending itself to formats such as lyophilized reagents for storage and transport. Beyond basic protein expression, microbial CFPS is increasingly used as an adaptable production environment in which reaction composition can be tuned, accessory enzymatic functions can be introduced and post-translational modification strategies can be engineered to better align with product requirements. The expanding range of microbial chassis further broadens the design space, allowing platform choice to be guided by functional, regulatory and deployment considerations rather than yield alone. However, increased capability has not yet translated into routine manufacturing use, and persistent barriers include reproducibility, vulnerable supply chains, limited scale-up practice, downstream purification suitable for therapeutic products and the absence of CFPS-specific quality and regulatory expectations. Overall, microbial CFPS is best evaluated not as a replacement for existing biomanufacturing but as a complementary manufacturing paradigm whose industrial relevance will depend on establishing standardization, economics and regulatory readiness.